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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72b8754fbc38be2efa3dfec046241301c403cd7ccaa5795d425f119956a435f' 
  AND token = 'plOh/hOAT51SeK/lEcXjLONvApHEFzlAxL4NHJ1jHfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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