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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ff0881cca891656111da8df9a7fe2427881273338a4d5c2fbe523df6f11323' 
  AND token = 'gV1H17VlEyX0BtS2rYFdYE78ZpaQDFX8jPVR2Gy6SU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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