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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c67be2e538b37be074b64efa8cb1d1226e7703743fe234bd2a5a48f5e3b34e' 
  AND token = 'Tr0USJkyrld6UH8mF3CfpZ6P1M2K+qRa5gaw0pmSQ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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