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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410ae62b0edba5172d4258f0ec0bb76293ea47d78c47bb99dd636492ff8c4030' 
  AND token = 'egkzJM4f0UgFwC6D3xTQ57AgsjCAjDTFAWQvR6n41dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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