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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c331230e4d06fa0414d51dcff139d1b9494a20328f45930c38a4a9456f051b03' 
  AND token = 'mfXuPY+dGU/ysxdRmFfeCKay7Z4Hjs/LlE1ySOkcRiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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