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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4de66361e2a8c21c412456ed42167db71695932026cdb79a922d86e888d87af' 
  AND token = 'pyJcO0TVT2bUS//Q0kytB8s/gU7BzKKU/4NQueKiTco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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