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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c3e412c20b37089dbb7f1c0c8a51785531e397696d65fdc8b4010be7129ea7' 
  AND token = '+MpGXQon2TyJjh2E17L4iWL9px7dpCSMvaYD97zwJJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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