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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bbc30f9c032d30c82329b4154953aaa07b1eeb175026f00b77dc96101c4c3e' 
  AND token = '7cNbfRcLunJ0uF95/j5vRKnAQMaXNX32JH91htYyH2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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