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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba26e686ca924020e1a00ba82db896f3ea2a15fa5817cddbe662159a2334eb1f' 
  AND token = 'Zve7yq3Abd2+FBaY/F3rwO8PR51MDM8nGoa+AgJLGsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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