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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ab240f9b9b0dd60207b9d674fdfd46d6cd3d6d5557a725a30d2f81d812d04d' 
  AND token = 'BZSWytVaCcc4yB0vMtcuR8ABs3cjl2NAwSTahOw4WSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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