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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef2c36941e475ae6670fc76c1e067156ebee1a0f0e075aacd488c4f7f3b7069' 
  AND token = 'zG+MBLPXE0TOFBkzBGi21Bzt5nRlWlViSlyO3ZYiu9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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