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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c990b8a4d9dacfc9978277ea6cf6973169f3f88501ce7124dfc861102c341e' 
  AND token = '+QM/IyFB8HztdvhR1vszF9CAyVloG7V4cyD1qT8ynBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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