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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c473d4f00c99a74b3494fb1579a1278ca062e4633c3d836202d0357db60cdd0a' 
  AND token = 'IJhniSMfFdYNijSgNa9Hi8lguxI5D+0am/LcOQCqlVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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