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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99af2d124318e7497edc26ef8ca8c9408cbaa587de82e82f3e3a66474658a004' 
  AND token = '4HUdqGKZJAZKseRDF52pXZ4blNvEcEWnxPlsbin9NR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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