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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b95dd03b0b7e8b5d6ff587438321c40a20601c970fcd0a3cded264c3a764e58' 
  AND token = '2ue2/wYegNRkzTTHA8ze4Wn9FT0R23aQdJSlTdl1erY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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