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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44540d9f835997aeb40f02e40dd4e39eee3b4c1091058ac4fff1577d6b41e206' 
  AND token = 'jXhp8ZRpkDubh40Q5rCpyX0k9UZGV12QaSyoO1Mu32Q=' 
  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"
    }
  }
}