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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ec931dbedf27889bfb6873b93e974693143ec3e2dcf4916b6f4422c86093bb' 
  AND token = 'EYGU1aNi6prh1V6FmgG5gVg0NWL36IkbMqyVEBl+xoE=' 
  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"
    }
  }
}