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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a41c67a0ec00cd12af4d1f6884204f60c10b73e19d75b91ab05f51909d7124e' 
  AND token = 'WaKfSF5bQAoDJXF7mZaLWPmjZFOcuNDCXrE2C20ltZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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