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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f38d49e7ab331127f0c59cdc7f422734b66290e0728a327f948afd7eb81bcd1' 
  AND token = 'DpsjPOpmYw4VwHyebGUruRk9ZmA3DowjTodt9+JvAM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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