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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6665ca6b9b650bd8de766c42bc4ca2c87cfc07eb03f8bb26ca3f0ea855cc224d' 
  AND token = 'v1HPS9eW3/YvlgfbfLTaha7fBKwybAGlbBZwTOuuKTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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