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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafe8608339591fbe5c8a6d33a072d581c22c04e35e9ea13a4845ac2d8e77af3' 
  AND token = 'NY0ScSg3G6LL4v+38J5+ejuH0VHQkCAb95ZPzaXEYTA=' 
  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"
    }
  }
}