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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171d7982aaa8a7aa29e62b7039c38f44baac5d6bece030a9ee25a572af3cdbf3' 
  AND token = 'ngEfr1A2Bzr08YxYT4jEDzVP6dcWbXUPmMBOKS3A61M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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