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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f990b18774e97aa80d2a46fda33df061c92e258513281d6888ef29b1755a2e74' 
  AND token = 'eLjhLDDWf8DLYiWaeBbVRcY3lXDSC8ffKuIk2DYtBec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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