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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c6bb20413756e2589f499ab94f988eb8b417ed149d3ad0c36233fa0bdc6e15' 
  AND token = 'rh3i6eBlEPScKrtzxxhqOef0dD/PbTjgXDRQtp+eE8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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