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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b90a402450a2a6e642e838f3a0887b91a1a6ce0fac501a1b85fb56c0c7f639' 
  AND token = 'oxDsgsGQNBnZw3um6oojoy8+NwJeNWAzrpjWV7pXgrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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