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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b3e28739827eb7caf476c11f102508c3150bd5a71c26cf0222fa85a34c0830' 
  AND token = 'hjAo4sNCtBHIQIX+nV3Sk8e5sf6Fz19ERBvKorAc16U=' 
  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"
    }
  }
}