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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6d2f7e1d39cf45e7431dbbb2543c7e44458bf6ef6ab1bd5c318d3962205198' 
  AND token = 'L8Kn5MUtEgOYnJ5LRIN8zJ4be8o0aLi3QAa82JAM/tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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