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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca449e4a95707e817d5ca14c6478eb4caef5fce566ede66755c3737e68bce6a' 
  AND token = '7TOcR1P4bXwNxufKbYVSDS1qCH3kk6y9u10omZiN9yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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