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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0657e194e22f41d1283604cfc4eb74cbfe568bdbb99a25ffe73053af7801c03' 
  AND token = 'JopFJ2s15bVRqMoJzAo19cMoH0HP9W483o5E9XLif40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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