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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19b4689057eb317c82b1ab8c4d0990f4972c7937a73741aa2362bc519ca0e8e' 
  AND token = 'wFTDo+CIsB1reytqDNcd1EkWF6fzgrVDbY7o3haMX2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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