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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecb60602b0bb9c7606c538b8ea593393129597c6d9fbb002273dd1930f2425a' 
  AND token = '3MKq8Hc32kjwc5c5itIeg3/1lM5t4hCV3/Rd7FtWY8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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