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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63261ab8c1cd955ecd3fa7f7eb49ea162592abf35f2ec3ae140e78a089afc6f' 
  AND token = '0EtHZ6Zac08V5xCxJA5YXqAOvJnIF5XMm7wodx5Z0eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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