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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72ec6f0869b1642025d16c9b648c2186325877790890ce00d25f121058420f3' 
  AND token = 'KtkCgWxzwXFlPha+scL4GD08Yc3klDTGZ93ZS2CPr18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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