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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634da0a99c920f33a3256ea11ff3f4fbdb2a1a8cab7d7d697d84594dfda95fa7' 
  AND token = 'Om9MLeYa4c6AAx+v9vecadbvxGf0yrNC57955TWslZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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