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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466c96f8e726fbbec781f279267b3962b6d0da5cdd39a8181f1dd630d1519c69' 
  AND token = '4cjLNSVGyErHkvaGaKCaDuer8sgocsVOo+E+BHvyTAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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