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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf230f52543797d72e17b49affce560db21ba766be45f816c2e1cbd9242f9ec0' 
  AND token = '5o9y6vuEO0HTCHpYsdLVY+Z8QiX8omy29NQSrc+x+do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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