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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b5dd250521875a08d045b786dadae4565d72d735a641d921ad2eeb4a97fac1' 
  AND token = 'rB0OsFya4dz6kL4tYvU7d7wI+rxj5MPhv79jp6JIuZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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