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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a65ca66c0adf79d79baa1052b448a06eb2a57d58b130b05ca88cce69109dce' 
  AND token = 'yMwisvTORE3TBRG1kWiLfS6WvwpQ/K/yfiaf7glI+0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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