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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec1292e45c8f60ec65c1d17494597a2527127ed573eb744863b1f547871a6d7' 
  AND token = 'CYGQT06HLrNxV3WyNor1iEsm4vEn1r05ww9BEabJsmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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