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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111fd1e247896e460feae17a4fb219f3caecc3b0c578cb9c74fd1d15014529de' 
  AND token = '+i5/pR2g51A0EEYXb+nfzzGWqIsibdmGKiW7K/K9ofA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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