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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5810a93aa06002836df6c019ae0d79062f09b8e4e33bf99acab273e4c67563e' 
  AND token = '5o6E5j5ORQCNVEVbfnqhsuZPIBxm1zPwcL89muccCnw=' 
  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"
    }
  }
}