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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bd9d05638326798a1a38aa1fd017dea51986af2f0c32371db9e58d118c1cfe' 
  AND token = '61CU2khmVsJQv2nc0OLUdVIXGUa7JOGoEDwP8X4sHOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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