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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbd689158900805ba176aa23ec0892a055ca7f63e5570c51d4ac5f9c5baa683' 
  AND token = 'cHEgHKxZJm/9oI1f0Ftu6vB075wUJXize6K3lMG+o0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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