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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd395f772799d8d6c2dc792124720fd7824a0a86d31a1ef0ba7d37ea68d2e6b' 
  AND token = '8vsrpaUzv7cvr7xCZdpbV2/wHh7943JgXImZC7FjSvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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