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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2d5994fec478504b3097a872604e7633f483c4bfd2d1875fb9cff3614ac710' 
  AND token = 'PJdfOwlYeNh39etMDweq58V2NJan0liRCs4QNCIVkXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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