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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca5889f64b9a27f49dbe0cac64f0a5236a94291ffedf13385fe1ab4b3bdcc82' 
  AND token = 'Pw8Xf15NBZKJZR8B18/3tLMVjOaTYFWNkxPwrRt9x5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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