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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd15ed5c23c57566a6cd37b6c78c6a9cd12aba9d93a78cc2035548ba45f47e73' 
  AND token = 'I4B32uoICRigdFMOQWqd5Q18T+gSl3Xlrk03jQ7/EBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}