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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514e415c8f1a2637d24be042dc4fca7b555d4d569c07728a22e47911e8494fff' 
  AND token = 'xA9s9/jiHnPvHv6xQy83LgEULswIZ1Uy0aq6TaS21Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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