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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5a144c56f9558eee44997dd6460d6449853ea2b1f817fd9018aa8fe6f2b9a3' 
  AND token = 'kC66RFT1L1eyektdFDgB2YmKoi7w3q8RddyhbdV3K48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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