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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e1c0c73a09bb9e250e412d781dd0e12005717998ce0355e319985bbdab7914' 
  AND token = 'nEDyQ7OHmOK5Nl7Vor//+qYqnPBf3YJ/Sv2/IIUeVe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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