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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166c8c56d733c9c27dd1bd6eaf418d5a660463f8f188962405da8ce6b8af49d3' 
  AND token = 'IV+QM1q7BbQw/owsSwq0x7zXr0LV9pm6oi7vjs7WAdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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