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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88348b4eedbe30a55e9747c0396906aed1b5c22c5975c01567acbbf5a384cd6' 
  AND token = 'ra/SZxnuMAr0cuPKzsz73tK3oMq2U1bpiJ6ZjN02esM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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