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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a18a489129a38d6fec29b7d44f7f53ea965895b22ad37cddcce457ce32a79b3' 
  AND token = 'GRGdcApMnUb8kRFl5K0Nww66C3urJ3P/tzLNYuiK2CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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