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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dd814bf23f03a2755f99d1d3d5ccd70c9cffe9d7cb8b98507d173297af4033' 
  AND token = 'i9zFZeQIJlxD/EtzlRou9rv1cM8vJ5ShwTR/iGjxCEM=' 
  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"
    }
  }
}